Kurama might start to lose his power in Naruto's jail. Since he's confined, his connection to the natural chakra sources could be severed, causing him to weaken gradually. Naruto would then have to find a way to restore that connection, perhaps by finding a hidden key within his own memories that unlocks the jail and restores Kurama's power.
It's possible that in the fanfiction, the jail in Naruto's mind where Kurama is trapped is not a normal jail. It could be a sort of purgatory where Kurama is forced to relive his past mistakes over and over again. This could be a test for Kurama, and Naruto, through his strong bond with Kurama, might be able to enter this purgatory - like jail in his mind. There, they could work together to break free from this cycle and emerge stronger than ever, with a deeper understanding of each other.
One idea could be that Kurama is trapped in a special jail within Naruto's mind. Maybe it's a result of some dark magic or a side effect of a new jutsu Naruto attempts. In the fanfiction, Naruto could be desperately trying to find a way to free Kurama while also dealing with the internal chaos that Kurama's imprisonment causes within him.
In such a fanfiction, there could be a very unique bond formed between Naruto and Kurama. Maybe Naruto would gain even more power as a result of this special relationship. They might be able to communicate on a deeper level, sharing thoughts and emotions more freely.
In such a fanfiction, Naruto might become extremely powerful at a young age. Kurama could teach him unique jutsu and survival skills. He would also likely have a very different view of the tailed beasts compared to canon Naruto.
There could be a time - travel fanfiction. Naruto, with the help of Kurama's power, accidentally travels back in time and meets a young Gaara. Naruto then tries to change Gaara's future for the better, using his knowledge from the future and the power of Kurama. This could create a whole new set of adventures and relationships between the three.
In this kind of fanfiction scenario, Naruto might gain some unique powers and skills. He could learn advanced chakra control techniques that are specific to the future version of Kurama's knowledge. Maybe he would also have a different perspective on his ninja way, as the future Kurama might have different insights based on events that haven't occurred in Naruto's time yet.
If Kurama takes over Naruto in fanfiction, it could lead to a shift in the power dynamics. The village might be in danger as Kurama's takeover could mean Naruto loses his usual self - control. But on the other hand, it could also open up new storylines where the other characters have to find a way to bring Naruto back, perhaps by appealing to their past bond or using some long - forgotten jutsu.
If we consider a fanfiction where toddler Naruto meets Kurama, it's a whole new world of possibilities. Toddler Naruto is likely to be more fearless and naive compared to his older self. He may not understand the danger that Kurama represents. Kurama, despite his tough exterior, could be taken aback by this small, fearless human. This meeting could result in Kurama having a soft spot for Naruto from the start. It might also lead to Naruto having some early access to Kurama's power, like being able to draw on a small amount of it unknowingly. This would make for a very different Naruto growing - up story in the fanfiction.
In such a fanfiction scenario, Naruto might use his knowledge from the future to prevent some disasters. For example, he could stop the Uchiha massacre by warning the clan early. He could also teach his younger self some advanced jutsu techniques, which would make him stronger much earlier in his life.
If Naruto Kurama was a Sacred Gear in fanfiction, it could lead to some interesting battles. He might be able to combine Kurama's abilities with the unique properties of a Sacred Gear. For instance, he could potentially unlock new forms or abilities that are a blend of Naruto's ninja skills and the Sacred Gear - like nature of Kurama. Also, it could change his relationships with other characters. Allies might view him differently, and enemies would need to reevaluate their strategies against him.
In the 'naruto kids meets kurama fanfiction', it could be that the kids are initially scared of Kurama. But as the story progresses, they come to understand his importance and his past with Naruto. They might even form an unexpected bond with the great fox, leading to all kinds of adventures where Kurama uses his wisdom to guide the kids through tough situations.